Difference between air volume and vapour volume

Air volume shows the volume of air that has entered through an air valve or Discharge-to-Atmosphere node, whereas vapor volume shows the volume of vapor from vaporous cavitation, which occurs when the pressure drops below the vapor pressure limit (see calculation options) and boils at room temperature, forming a vapor pocket. See: Assumptions and limitations of tracking air or vapor pockets in HAMMER

If your organization has a SELECT subscription, I would recommend listening to the formal HAMMER training videos and workshops, available on learn.bentley.com. The lectures (recorded by me) cover the topic of vapor and air. There is a link to the HAMMER Learning path, plus other resources, here: Learning Resource Guide for new users of Bentley HAMMER

Air volume shows the volume of air that has entered through an air valve or Discharge-to-Atmosphere node, whereas vapor volume shows the volume of vapor from vaporous cavitation, which occurs when the pressure drops below the vapor pressure limit (see calculation options) and boils at room temperature, forming a vapor pocket. See: Assumptions and limitations of tracking air or vapor pockets in HAMMER

If your organization has a SELECT subscription, I would recommend listening to the formal HAMMER training videos and workshops, available on learn.bentley.com. The lectures (recorded by me) cover the topic of vapor and air. There is a link to the HAMMER Learning path, plus other resources, here: Learning Resource Guide for new users of Bentley HAMMER